Add regCode parameter to ClientCreator

Sources/ElixxirDAppsSDK/ClientCreator.swift

 import Bindings
 
 public struct ClientCreator {
-  public var create: (URL, Data, Data) throws -> Void
+  public var create: (URL, Data, Data, String?) throws -> Void
 
-  public func callAsFunction(directoryURL: URL, ndf: Data, password: Data) throws {
-    try create(directoryURL, ndf, password)
+  public func callAsFunction(
+    directoryURL: URL,
+    ndf: Data,
+    password: Data,
+    regCode: String? = nil
+  ) throws {
+    try create(directoryURL, ndf, password, regCode)
   }
 }
 
 extension ClientCreator {
-  public static let live = ClientCreator { directoryURL, ndf, password in
+  public static let live = ClientCreator { directoryURL, ndf, password, regCode in
     var error: NSError?
     let network = String(data: ndf, encoding: .utf8)!
-    let created = BindingsNewClient(network, directoryURL.path, password, nil, &error)
+    let created = BindingsNewClient(network, directoryURL.path, password, regCode, &error)
     if let error = error {
       throw error
     }
@@ -24,7 +29,7 @@ extension ClientCreator {
 
 #if DEBUG
 extension ClientCreator {
-  public static let failing = ClientCreator { _, _, _ in
+  public static let failing = ClientCreator { _, _, _, _ in
     struct NotImplemented: Error {}
     throw NotImplemented()
   }